NewCronJobInformer constructs a new informer for CronJob type.
Always prefer using an informer factory to get a shared informer instead of getting an independent
one. This reduces memory footprint and number of connections to the server.

NewFilteredCronJobInformer constructs a new informer for CronJob type.
Always prefer using an informer factory to get a shared informer instead of getting an independent
one. This reduces memory footprint and number of connections to the server.